The connotation of calligraphy can be summarized as: Yin and Yang (the strokes of Fiona Fang), space (the layout of characters), time (the law of the speed of calligraphy), and being a person (the heart is right, the strokes are right, and the characters are like people).
In fact, there are many things summarized in calligraphy, such as aesthetic philosophy, literary poetry and so on.